What is the relationship between Za and Zb?​

The relationship is that they are vertical angles

First plot the point (-1/2, 1/2)secondly go up one to the left one from your starting point repeat this until you reach the end of the graph be sure to plot each pointthird go down one to the right one from your starting point repeat this until you reach the end of the graph be sure to plot each pointfinally connect all the dots